Milling and keyway-cutting attachment for lathes



W. G. AND C. EDWARDS. MILLING AND KEYWAY CUTTING ATTACHMENT FOR LATHES.

APPLICATION FILED JUNEZB. T920.

Patented Feb. 7, 1922;

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PATENT OFFICE.

WELFORD e. nnwnnns Am) CLAYTON EDWARDS, or PLAJNVIEW, MINNESOTA. f

Mur ne AND KEYXVAY-CUTTING ATTACHMENT non LATHES. 7

Application filed June 25,

To all whom it may concern: Be it known that we, *CVnLronn G. ED wares and Cnarro: Enwanos, citizens of the United States, residing at Plainview, in the county of .lVabasha and State of Minnesota, have invented certain new and useful Improvements in Milling and Keyway-Cutting Attachments for Lathes; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. i 7 Our invention has for its object to provide an extremely simple and highly efficient milling and key-way cutting attachment for lathes, and to this end, it consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the severalyiews.

Referring to the drawings: V

Figure 1 is a plan view of the attachment and a portion of a lathe, with some parts broken away; i

Fig. 2 is a view principally in side elevation, with some parts shown in section and other parts diagrammatically illustrated by means of broken lines; and

F ig. 3 is a front elevation of the Inent removed from the lathe.

Fig. 4 is a vertical section on a somewhat enlarged scale taken on the line 44 of Fig. 1. 9

Of the parts of the lathe illustrated, it is important to note the bed 4, carriage-ways 5 having T-shaped channels 6, milling tool 7, and tool post 8. The attachment includes a flat base plate 9 adapted to rest transattachversely on the ways 5 and provided with a longitudinally extended and centrally located slot 10, through which extends a pair of nut-equipped bolts 11. The bolts 11 have T-heads adapted to be secured in the channels 6 for detachably securing the attachment to the lathe carriage. Obviously, the slot 10 permits the bolts 11 to be set different distances apart in order that the attachment may be applied to lathes of different widths.

Secured to the inner end of the base plate 9 is a wide hingelug 12, and the forward end of said base plate is bifurcated to afford a pair of prongs v13 to the upper faces of which is secured a pair of bearing blocks S ecification of Letters Patent. I Patented Feb 1,1922

1920. Serial No. 391,758.

14; A vertically swinging nut block 15 is mounted between the prongs 13, and provided with a pair of trunnions 16 journaled in seats formed in said prongs and the bearing blocks 14. r

A pair of track rails 17 have their rear endsarranged to'receive' therebetween the hinge lug 12, and are pivoted thereto by a hinge bolt 18 for vertical'swinging movement. These track rails 17 are rigidly but adjustably connected by cross-ties 19 hav ing one of their ends rigidly secured to one of the track rails 17 and their other ends are provided with screw threads and inserted through bores in the other of said track rails. Opposing nuts 20, on the screwthreaded ends of the cross-ties 19, rigidly hold the respective track rail. 17 therebetween with freedom for adjustment toward and from the other of said track rails.

The free ends of the track rails 17 are raised and lowered by a vertical feed screw 21 mounted in the nut block 15 and having its upper ends swiveled at'22 to the front cross-tie 19. On the lower end of the feed screw 21 is a hand piece 23, by which said feedscrew may be'operated to raise and lower the free ends of the track rails 17. Mounted on the track rails 17 is a workholding carriage 24, having on its longitudinal' edges flanges 25 slidably mounted in longitudinally extended grooves 26 formed int-he inner faces ofthe track rails 17 above the cross-ties 19.- This carriage 24 is further guided and supported on the track rails 17 by a pair of horizontally spaced plates 27 rigidly secured to the upper face of the carriage and slidably supported on theupnal groove 26 in the track rail for free sliding movement.

Resting on the carriage 24, between the plates 27, is a'work support or table 28,

which, as shown, extends the full length of said carriage and is provided in its upper face with a longitudinally extended and centrally located V-shaped groove 29, to receive and hold a {piece of work, such as a shaft Z, as best shown in Fig. 3. To clamp and hold the work in the groove 29, there is provided a clamp, in the form of a pair of upright nut-equipped studs 30, and a clamp- To operate the work-holding carriage 24,

' on the track rails 17, there is secured, in the customary slot in'the tool post 8, 'a rectangula-r metal bar 32 having on one of its ends a trunnion 33. One end of a link 34L is pivoted to the trunnion 33 and its other end is pivoted to a trunnion 35 on one of the carriage plates 27. lVith the carriage 24' thus connected to the tool post 8,'the samemay be moved by the cross feed of the lathe carriage to feed the work Z to the milling tool 7. The above described attachment may be very quickly applied to a lathe carriage or removed therefrom without disturbing any of the parts of the lathe. By the use of the improved attachment, thereis no waste of time in lining'up the work and the depth of the cut in the work may be regulatedby the feed screw 21. This attachment may be used in cutting all kinds of key-ways, including the \Voodruif, squares and surfacing, and without any chatter vor trembling, regardless of depth of cut or feed. lVhen the track rails 17 are in horizontal position, the keyway canbe cut with its bottom parallel to the axis of the shaft. A key-way can also be so cut when the tracks-are inclined by suitably turning the feed screw 21.

What we claim is: v 7 v 1. An attachment of the kind described comprising a base, a track having one of its ends hinged to the base, an adjusting screw for raising and lowering the other end of the track, a carriage arranged to, travel on the track, a work-holding device on [the riage.

QQAn -attachment of the kind described comprising a base, a trackhaving'one of its ends hinged to the base, a feed screw 'swiveled in the other end of the track, a nut block on the feed screw secured to the 7 base for swinging movement, a carriage ar ranged to travel on the track, a work-hold ing device on the carriage, and means for.

operating the carriage.

3. An attachment of the kind described comprising abase, a pair of track rails lunged at one of their ends to the base, crossties adjustably connecting the track rails,

said track rails having on their inner faces longitudinally extended grooves, means for raising and lowering the other ends of the track rails, a carriage slidably mounted in said grooves, a work-holding device on the carriage, and means for operating the carriage.

a clamping bar on the studs, and 'mea'nsfor operating the carriage.

The combination w th a lathe, of a base secured to the lathe, an adjustable track secured to the base, a carriage arranged to travel on the track, and means for operating the carriage fiom a inovable part' of the lathe. 7 i

G. The combination with'a lathe, of a base at. An attachment of the kind described detachably secured tothe lathe carriage, an 7 adjustable track secured to the base, a car'- i'iage arranged to travel on the track, and means for operating the carriage from the tool post of the lathe. i

detachably secured to the lathe carriage, an achustable track'secured-to the base, a carriage arranged to travel on the track,and a I 7 link having one of its; ends pivotedto the carriage, and means for operatingthe car- The combinationwith a'lathe, of a-base c I last noted carriage and having its' other end. '7

' pivoted to a part carried by the tool post.

' Iii-testimony whereof we aflix our signatures in presenceof twow'itnesses. 

